If there is no ref it is. And your opponent isn't hovering but back in his chair where he belongs then it's really up to you to call it on yourself.
I guess we will never know for sure but if karma is the judge as usual then the right person won.
Not sure how I feel about it to be honest. I grew up calling myself, and when I was learning to play snooker if I 'cheated' dad would pack the shit up and home we'd drive.
Living here I've observed some marked cultural differences with regard to calling:
For the most part, I have found people from the US rely on the opponent noticing, and won't call themselves unless they feel it's super obvious.
Europeans tend to call themselves, even when the opponent might not notice, often to their own detriment.
Chinese foul, laugh and see how serious you are, try to move the ball back and carry on like nothing happened.
Obviously not the way it plays 100% of the time, but behaviors/observations described briefly from my perspective that I have seen numerous times.
I'd say, as the opponent, eyes on the game. Assume everyone is out to get you lol certainly learned my lesson with regard to honesty, or assumed honesty on several occasions. Lee Van could have watched closely, Joshua could have admitted it. Neither really matters in the grand scheme of things. As karmic justice played out.
